/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
 * file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
 * to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 */

package com.spark.sniffer.logging.api;

import java.util.logging.LogManager;

import com.spark.sniffer.logging.core.EasyLogResolver;
import com.spark.sniffer.logging.core.Sl4jLogResolver;

/**
 * LogManager is the {@link LogResolver} implementation manager. By using {@link LogResolver},
 * {@link LogManager#getLogger(Class)} returns a {@link ILog} implementation. This module use this class as the main
 * entrance, and block the implementation detail about log-component. In different modules, like server or sniffer, it
 * will use different implementations.
 * <p>
 * If no {@link LogResolver} is registered, return {@link NoopLogger#INSTANCE} to avoid {@link NullPointerException}. If
 * {@link LogManager#setLogResolver(LogResolver)} is called twice, the second will override the first without any
 * warning or exception.
 * <p>
 * Created by xin on 2016/11/10.
 */
public class LoggerFactory {
    private static LogResolver RESOLVER = new Sl4jLogResolver();

    public static void setLogResolver(LogResolver resolver) {
        LoggerFactory.RESOLVER = resolver;
    }

    public static Logger getLogger(Class<?> clazz) {
        if (RESOLVER == null) {
            return NoopLogger.INSTANCE;
        }
        return LoggerFactory.RESOLVER.getLogger(clazz);
    }

    public static LogResolver getResolver() {
        return RESOLVER;
    }
}
